showcasing a debugged out, retail PS3 Slim flashed with a custom 3.66 PUP. Yes the PUP is available -- but before you jump to any rash decision -- know this: There is no backup support, no custom payloads/syscalls, no geohot jailbreak (unsigned) homebrew ... there's nothing like that.

You can access PSN and all the XMB debug settings; but again, Install Package Files won't be installing any homebrew or pkgs ... you still gotta wait for that, and that could be a long while.

Really it's not worth upgrading just yet, which brings me to my next point: There is no turning back if you take the plunge by upgrading your 3.55 (or lower) hacked console ... unless you have an InFeCtuS chip and know what you're doing.
Bricks? No idea. I haven't tried yet. For that reason we aren't hosting the custom PUP here.